301. Ipomoea elongata Choisy in A.P. de Candolle, Prodr. 9: 355. 1845. (Choisy 1845: 355)

Calonyction dubium M. Martens & Galeotti, Bull. Acad. Roy. Sci. Bruxelles 12: 268. 1845. (Martens and Galeotti 1845: 268). Type. MEXICO. Oaxaca, Misteca-Alta et Yavezia, H. Galeotti 1362 (lectotype BR00006972943, designated here; isolectotypes BR, G).

Ipomoea dubia (M.Martens & Galeotti) Hemsley, Biol. Centr. -Amer., Bot. 2: 286. 1882. (Hemsley 1882: 286), nom. illeg., non Ipomoea dubia Roem. & Schult. (1819) .

Ipomoea mestecensis House, Bot. Gaz. 43: 411. 1907. (House 1907b: 411). Type. Based on Calonyction dubium M. Martens & Galeotti

Type.

MEXICO. Oaxaca, Andrieux 212 (holotype G00135527, isotype K).

Description.

Trailing or twining perennial, stems slender, nearly glabrous. Leaves petiolate, 2.3-5.5 × 1-2 cm, deltoid, acuminate to an aristate point, base sagittate with elongate, lanceolate or ovate, acute, sometimes bifurcate auricles, margin entire, undulate or with a few broad teeth, both surfaces glabrous to thinly pubescent, abaxially paler; petioles 1-3 cm, thinly pubescent. Inflorescence of solitary (rarely paired) pedunculate, axillary flowers; peduncles 5-48 mm, sometimes penetrating leaf sinus, thinly pubescent bracteoles 1-2 mm, deltoid; pedicels 3-19 mm, commonly bent at right angles to peduncle, thinly pubescent; sepals unequal, outer (5-) 8-9 × 2-2.5 mm, lanceolate, acuminate, glabrous but often muricate on dorsal surface, inner (8-) 9-11 × 3 mm, oblong, obtuse, mucronate, margins broadly scarious; corolla 6-10 cm long, narrowly funnel-shaped with a long gradually widening paler tube, glabrous, midpetaline bands terminating in a distinct tooth, limb pink 3.5-4 cm diam. Capsules subglobose, glabrous; seeds 4, 6-7 × 4-5 mm, puberulent.

Illustration.

McDonald (1987c: 84); Figures 8Q, 148.

Distribution.

Low oak woodland and scrub, mostly between 1500 and 2500 m in southern Mexico and Guatemala.

GUATEMALA. Huehuetenango, A. & A.R. Molina 26497 (F).

MEXICO. Est. México & Dist. Fed.: Temascaltepec, G.B. Hinton et al. 4987 (K); ibid., Nanchitla G.B. Hinton et al. 8474 (K); Valle de Bravo, E. Matuda et al. 31768 (MO). Guerrero: Mina, G.B. Hinton 9703 (GBH, K), Manchón, G.B. Hinton 9646 (GBH, K, MO), Montes de Oca, G.B. Hinton 11542 (GBH, K). Michoacán: Charo, Pie de la Mesa, E. Carranza & M.E. Molina 7143 (IEB). Oaxaca: C.G. Pringle 4693 (BM, CM, K, MO); Cerro San Felipe, C. Conzatti 4975 (MO); El Cerezal, Ixtlan, D.H. Lorence et al. 3542 (MO); Cerro Verde, San Luis Tultitlanapa, C.A. Purpus 3535 (BM); San Felipe Tejalapam, M. Cruz 570 (IEB); Juxtlahuaca, A. Garcia Mendoza 5093(MEXU). Puebla: Lomas de San Alfonso, J.L. Contreras 7749 (MEXU); Cerro del Pavilan, C.A. Purpus 3904 (BM, MO). Querétaro: E. Pérez & E. Carranza 3766 (IEB); Jalpan de Serra, E. Carranza et al. 5872 (IEB).

Note.

The muricate outer sepals are rather distinctive. Some Querétaro specimens have large lateral teeth.